Intermittent Temp Gauge Issue
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Cadillac STS Forum - 2005 through 2012 Discussion, Intermittent Temp Gauge Issue in Past Cadillac Vehicle Discussion; I've noticed over the last few weeks that my temp gauge will just randomly stop working, it just sits at ...
  1. #1
    curtc's Avatar
    curtc is offline OCD - Obsessive Cadillac Disorder
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    Intermittent Temp Gauge Issue

    I've noticed over the last few weeks that my temp gauge will just randomly stop working, it just sits at cold the entire time. This last week it did it three times on the way to work, on the way home it worked just fine. The coolant level is normal, A/C/heat works fine, do I have a bad t-stat? Or is there a sensor on the fritz that could cause this behavior?
    Past Cadillac's

    2004 CTS 3.6L - 2011-2012
    2001 Seville Touring Sedan - 2006-2011
    1995 Seville Touring Sedan - 2005-2006

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    carter's_sts is offline Cadillac Owners Connoisseur
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    I know the Vs at least have any issue with bad T-stats causing the car to not heat up fast enough. That will cause the temp gauge to go to zero, but also trigger a message on the DIC.

    I'm guessing you have a bad temp sensor.

  4. #3
    curtc's Avatar
    curtc is offline OCD - Obsessive Cadillac Disorder
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    Re: Intermittent Temp Gauge Issue

    I have seen no messages on the DIC, just a gauge stuck on cold Where is this temp sensor you speak of?
    Past Cadillac's

    2004 CTS 3.6L - 2011-2012
    2001 Seville Touring Sedan - 2006-2011
    1995 Seville Touring Sedan - 2005-2006

  5. #4
    carter's_sts is offline Cadillac Owners Connoisseur
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    The coolant temp sensor, but sorry, someone else will have to chime in on the location. I've never had to change it on the STS.

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    jsiddall is offline Cadillac Owners Fanatic
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    Re: Intermittent Temp Gauge Issue

    I had intermittent low temperature and the stored code was for a bad thermostat. Sure enough, changed it, all good now.

  7. #6
    curtc's Avatar
    curtc is offline OCD - Obsessive Cadillac Disorder
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    Re: Intermittent Temp Gauge Issue

    OK, I will grab my scanner and scan again...I have a CEL for a bad cat presently but will check to see if I have another DTC present beyond that one. It worked fine on the way to work and during lunch today. I hate issues like this that come and go as they please.

    Maybe I could try cleaning the contacts for the temp sensor? Just need to know where it lives under the hood...
    Past Cadillac's

    2004 CTS 3.6L - 2011-2012
    2001 Seville Touring Sedan - 2006-2011
    1995 Seville Touring Sedan - 2005-2006

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    jsiddall is offline Cadillac Owners Fanatic
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    Re: Intermittent Temp Gauge Issue

    I wouldn't waste your time with contacts. If it was an open circuit the PCM would detect it and set a code saying that is the issue. If you have your own scanner (ex: AutoEnginuity -- not just a code reader) you can read the temperature and see if that is really the issue or if it is just the IP. Otherwise you may just need to spend money at the dealer with their scanner when the problem is occuring to get a diagnosis.

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